which the receiver of the other’s digital message confirms the sender’s identity. What is the process of the receiver?

A and B are communicating using an authentication by which the receiver of the other’s digital message confirms the sender’s identity. What is the process of the receiver?

A.
Digital confirmation

B.
A message where there is one secret key and one public key that is involved

C.
Authencitcation proof

D.
Digital signature process